{"title":"Influence of grain size distribution characteristics on compaction and deformation-strength characteristics of gravelly fill material","authors":"Yuya Uemoto, S. Shibuya, Yosuke Hashimoto, Shunzo Kawajir","doi":"10.3208/JGS.6.181","DOIUrl":"https://doi.org/10.3208/JGS.6.181","url":null,"abstract":"粒径の大きな礫を含んだ実盛土の変形・強度特性を求めるためには，原粒度試料を用いた大型三軸試験の実施が望ましいが，原粒度試料を用いた試験には数多くの制約があるため，粒度調整した小型供試体を用いた室内試験を実施するのが一般的である。一方，盛土の締固め管理には締固め度Dcを用いるが，盛土材の粒度を調整すると試料の変形・強度特性ばかりでなく締固め特性も変化する。したがって，実盛土の変形・強度特性を正しく求めるためには，締固め管理密度に相当する原粒度試料および各種室内粒度調整試料それぞれのせん断特性を明らかにした上で，適切な室内粒度調整法を選定する必要がある。そこで本研究では，兵庫県西宮市の宅地造成現場から採取した粒子形状が角張った砂礫盛土材および兵庫県南西端部を流れる千種川より採取した円礫が卓越した砂まじり礫盛土材のそれぞれについて，原粒度および異なる3通りの方法で粒度調整した試料を用いた一連の排水三軸圧縮試験を実施し，締固め特性およびせん断時の変形・強度特性に及ぼす粒度特性の影響を明らかにしている。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126525913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Behavior of vegetation protection slopes during freezing and thawing","authors":"K. Ueno, D. Rui, D. Nakamura, Y. Ito, S. Yamashita, Teruyuki Suzuki","doi":"10.3208/JGS.5.413","DOIUrl":"https://doi.org/10.3208/JGS.5.413","url":null,"abstract":"冬季の凍上と春季の融解沈下を繰り返す地域の法面では，融解期に表層すべりによる被害が多く発生する。凍上の発生方向は熱流方向に一致し，融解沈下の方向は鉛直下方に作用する重力の影響を受ける。この時，法面では凍上が発生する方向と重力の方向が異なるため，凍上した地盤の表面は元の位置に戻らず凍結前の位置より斜面下方に移動する。この移動の毎年の累積が，法面の崩壊を誘発すると考えられる。しかし，凍結・融解過程における実斜面の挙動をとらえた報告はほとんど見られず，合理的根拠に基づいた融解時表面すべり崩壊の対策工法は未だ確立していないのが現状と言える。本研究では，北見工業大学構内の盛土法面で，植生方法の異なる4つの試験区間を設け，5シーズンに渡って凍結・融解過程における法面の挙動を実測した。結果として，1）凍結・融解過程における有限長の法表面の凍上変位，融解沈下及びそれらの成分として現れる移動量が実測値として定量的にとらえられた。2）法面のすべり崩壊を誘発すると考えられる法面下方への移動は融解沈下時に発生し，その大きさは発生凍上量に加えて，植生の成育状況，さらには植生補強の有無によることなどが明らかになった。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122002877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Energy-Based Liquefaction Potential Evaluation Compared with FL-Method: - Case Studies on Various Earthquake Motions and Soil Conditions -@@@^|^minus;種々の地震動・地盤条件での検討^|^minus;","authors":"Y. Mimori, T. Kokusho","doi":"10.3208/JGS.9.603","DOIUrl":"https://doi.org/10.3208/JGS.9.603","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133926759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ichiro Ishii, Ryouichi Hiradate, I. Towhata, S. Nakai, T. Sekiguchi, S. Sawada, Yoshihiro Hamada
This paper addresses the liquefaction disaster that significantly damaged houses and lifelines in Urayasu City on Tokyo Bay during the 2011 off the Pacific Coast of Tohoku Earthquake. Aiming at reconstruction and mitigation of damage during future earthquakes, subsoil investigation was carried out intensively in the city. It was found that the damaging liquefaction occurred in the reclaimed sandy layer near the ground surface as well as in the upper part of the underlying alluvial sand. The present paper provides detailed information about the liquefied ground and soil characteristics therein with special emphasis on relationship between building and sewage pipe damage extents and the locations of sand discharge during dredging works. Furthermore, undrained cyclic triaxial shear tests were conducted on undisturbed sand samples to show that the obtained liquefaction resistance is consistent with the resistance assessed by in-situ investigations and soil characteristics.
{"title":"Liquefaction-induced damage to houses and site characterization in Urayasu City during the 2011 Tohoku Earthquake, Japan","authors":"Ichiro Ishii, Ryouichi Hiradate, I. Towhata, S. Nakai, T. Sekiguchi, S. Sawada, Yoshihiro Hamada","doi":"10.3208/jgs.12.91","DOIUrl":"https://doi.org/10.3208/jgs.12.91","url":null,"abstract":"This paper addresses the liquefaction disaster that significantly damaged houses and lifelines in Urayasu City on Tokyo Bay during the 2011 off the Pacific Coast of Tohoku Earthquake. Aiming at reconstruction and mitigation of damage during future earthquakes, subsoil investigation was carried out intensively in the city. It was found that the damaging liquefaction occurred in the reclaimed sandy layer near the ground surface as well as in the upper part of the underlying alluvial sand. The present paper provides detailed information about the liquefied ground and soil characteristics therein with special emphasis on relationship between building and sewage pipe damage extents and the locations of sand discharge during dredging works. Furthermore, undrained cyclic triaxial shear tests were conducted on undisturbed sand samples to show that the obtained liquefaction resistance is consistent with the resistance assessed by in-situ investigations and soil characteristics.","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"11 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132826018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Examination of applicability of injection pipe that uses biodegradable plastic in the ground-improvement","authors":"Rei Terajima, S. Shimada, Tadao Oyama, S. Kawasaki","doi":"10.3208/JGS.5.425","DOIUrl":"https://doi.org/10.3208/JGS.5.425","url":null,"abstract":"生分解性注入管は，環境保全型地盤改良技術の一環として開発を進めてきたシステムである。地盤注入や土壌浄化の分野において注入管として微生物により分解可能な樹脂を使用することで，地盤改良後に管が二酸化炭素と水に分解され，環境への負荷を低減することができる。また，この樹脂にさらに古紙を添加することで，強度があり，かつ破砕しやすい注入管を得ることができる。本研究では，これらの注入管を実用できる状態にまで品質を向上し，物性評価を行った結果，従来使用されている塩化ビニルVP40と同等の強度を持つが，引張り破断伸びは小さく，破砕されやすく，地盤中の水にて加水分解され劣化しやすい性質であることがわかったのでここに報告する。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131265608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Noritaka Aramaki, S. Tamamura, Sho Tanaka, S. Kawasaki, Y. Fujii, K. Kaneko
Microbial methanogenesis occurs in diverse subsurface environments. Biogenic methane is produced during the metabolism of methanogenic microorganisms. These microorganisms have the ability to produce methane using low-molecular-weight organic acids as substrates. These substrates are decomposed from hardly decomposable organic matter present in the source soil or rocks. An in situ clean-up method of ground contaminated with such compounds has been established, incorporating the Fenton reaction, utilising hydrogen peroxide and iron compounds. In this reaction, OH radicals are produced which can decompose toxic organic matter in the soil. With the aiming at developing of the production engineering of biogenic methane gas in the subsurface environments, we have proposed a new geotechnical method, known as Subsurface Cultivation and Gasification. This approach employs hydrogen peroxide to rapidly decompose organic matter. In this study, hydrogen peroxide solution immersion tests were performed on lignite in order to characterise the structural changes resulting from oxidation decomposition of hardly decomposable organic matter. It was found that the quantity of low-molecular-weight organic acids required for the microbial methanogenesis process increased with increasing immersion time. In addition, the interior structure of the lignite mass was significantly altered in the oxidation reaction, suggesting that the microorganism habitat space could be formed inside the source material itself.
{"title":"Aging behaviour of organic matter decomposition and microstructure of coal using hydrogen peroxide for bio-methane production in subsurface environment","authors":"Noritaka Aramaki, S. Tamamura, Sho Tanaka, S. Kawasaki, Y. Fujii, K. Kaneko","doi":"10.3208/JGS.10.391","DOIUrl":"https://doi.org/10.3208/JGS.10.391","url":null,"abstract":"Microbial methanogenesis occurs in diverse subsurface environments. Biogenic methane is produced during the metabolism of methanogenic microorganisms. These microorganisms have the ability to produce methane using low-molecular-weight organic acids as substrates. These substrates are decomposed from hardly decomposable organic matter present in the source soil or rocks. An in situ clean-up method of ground contaminated with such compounds has been established, incorporating the Fenton reaction, utilising hydrogen peroxide and iron compounds. In this reaction, OH radicals are produced which can decompose toxic organic matter in the soil. With the aiming at developing of the production engineering of biogenic methane gas in the subsurface environments, we have proposed a new geotechnical method, known as Subsurface Cultivation and Gasification. This approach employs hydrogen peroxide to rapidly decompose organic matter. In this study, hydrogen peroxide solution immersion tests were performed on lignite in order to characterise the structural changes resulting from oxidation decomposition of hardly decomposable organic matter. It was found that the quantity of low-molecular-weight organic acids required for the microbial methanogenesis process increased with increasing immersion time. In addition, the interior structure of the lignite mass was significantly altered in the oxidation reaction, suggesting that the microorganism habitat space could be formed inside the source material itself.","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115478346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hideo Furuichi, T. Hara, M. Tani, T. Nishi, Kazutaka Otsushi, K. Toda
{"title":"Study on Reinforcement Method of Dykes by Steel Sheet-pile against Earthquake and Tsunami Disasters","authors":"Hideo Furuichi, T. Hara, M. Tani, T. Nishi, Kazutaka Otsushi, K. Toda","doi":"10.3208/JGS.10.583","DOIUrl":"https://doi.org/10.3208/JGS.10.583","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115763827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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